In order to mitigate the influence of the project construction inside or outside the reclamation area and meet the requirements of urbanization development,a sluice on the breaking seawall is often demanded.Anti-seepage and anti-wave are two major difficulties in the construction of open breaking seawall.Based on research results at home and abroad and similar engineering practice experience,and taking a sluice on the breaking seawall in Zhejiang for example,we describe the design process of anti-seepage and anti-wave on the filling with rubble stones.According to the comparison among similar sluices,we know that the measures adopted are reasonable.